Improvement in steam-engines



@ya W CI li btitcil ltater JAMES M. DAVIDSON, OF NAPOLEON, ARKANSAS.

Letters Patent No. 86,974, dated February 16, 1869.

IMPROVEMENT IN STEAM-BN GINES.

The Schedule referred to in these Letters Patent and making part of thesame.

leon, in the count-y ot' Desha, and Stute. ot' litrkansas.

have invented a nowand usetul Improrenmnt in Steamllngines; and l dohereby declare that. the tbllowing is" a. full, clear, and exactdescription thereof', which will enable those skilled in the art tolnake 'and use thc saine, retirence beingl had to the accompanyingdrawings, forming part ot' 'this #peeiticatioin This invention reiatcsto a new and useful improve- :nent in steam-engines, llowing-cylimhws,and all other machinery where cylinders and pistons ar'e used; and

[t eonsists in so construct-ing the pistou and pist-onrod, andconntwting'thc rod with the eyliinler-ln-ad, that a pitnian oreonnwting-rod and cross-hcad air dispensed with7 as will he herthaf'termore fully dcscribed.

ln the accompanying plate of drawingshigure. l represents a verticalcentral section ot' a steam-cylinder, with lpistou and rod, withthe'latter connected with the' pist-on and cyliluler-hezni, and packedaccording to my invention Figure .2 is a cross-section ot' fie. 1,through the line Similar letters ot' reference indicate correspondingparts.

A. is tbc cylinder is the piston.

C is the piston-red. K I-n dispensing with the pituian-rod andcross-head,

which usually connect the pistou-rod with the work-V ing-beam oftheengine, it is necessary to so construct the parts that thepiston-rod-wiil, in its up-and-down motion. contorni to the are ot-'fthecircle which is described by the end of the working-beam.

[u iny invention, i accomplish this in thc 'following lt is coutined tothe cylinder-heini by two trunnions il.

The piston-rod is pack-'ed in this oscillating box by ball-packiuerrings, 'onlined in aglobular cavity, formed in the top ot' the box andthe lower side ofthe cap I, as seen in the drawing.

lhese rings are so termedl that, by screwing the. paris l ogetber, asrepresented, the inner ring J (which is ent like thc ordinarypacking-ring, so that it may be compressed) may be adjusted Vto the rodso as to form va steam-tight joint, as it will be seen that the ringsare. made taperiner t'or that purpose.

["igurc 5l is a section oi' a wtuiting-beam, wit-b its t'ulcruin shownin red color.

it will be `seen that when in operation, the ond of the working-limon,vibrating on its` trunnions 'or fu1 crlnn, will dcs '-riln\the are ot' acircle, as indicated in thc drawing, and that, by this method otconnecting the piston-rial with the cylinder, theengine will workwithoutacross-hond, Aor a connecting-rod, (or pitIna-n,) 'and thepistou-rod will vibrate without strain or bilidng in any part, and withless' friction than the ordinary engine, as the nearing-surthee isgreatly reduced as compared with the eonunon engine.

The oscillating box ll, extending upward, asitdoes, from theevliiider-heaul, act-s as a guide for the pistonrod, while thetibi-ation ot' the rod renders@ connecting-rod unnecessary. 1 n i 'lllrewearing-surface, and consequently the friction, are great-ly reduced,while the application ofthe power is more direct, andthe working-partsare brought intol lating box E, cylinder-head G, t-runnions H, piston B,

and pistou-rod C l), substantially as. herein set forth. 2. Theconstruction ot' the ball-packing, with its cap, I, in the oscillatingbox E, con1bined with the piston-rod C, substantially as described.

' JAMES M. DAVIDSON.

NVitnesse:

J As. MURPHY, D. O. LOVELL,

W. E. ONEAL.

